【摘要】 目的:研究叶酸(FA)、维生素B6(VB6)和维生素B12(VB12)对局灶性脑缺血大鼠血浆同型半胱氨酸(homocysteine,Hcy)水平和抗氧化作用。方法:SD大鼠随机分为假手术组(Sham)、大脑中动脉闭塞模型组(MCAO)、MCAO+FA组和MCAO+FA+VB6+VB12组(MCAO+CV)。后三组均经手术造成MCAO模型,维生素补充前、补充28d后和手术后24h分别检测大鼠血浆Hcy浓度及血清超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性和丙二醛(MDA)含量,缺血后检测脑组织抗氧化指标。结果:补充FA、VB6和VB12后及缺血后,MCAO+FA组和MCAO+CV组血浆Hcy均低于Sham组和MCAO组,且MCAO+CV组低于MCAO+FA组;MCAO+FA组和MCAO+CV组血清或脑组织SOD和GSH-Px活性均高于MCAO组,MDA含量低于MCAO组。结论:补充FA、VB6和VB12能降低血浆Hcy浓度,提高机体抗氧化能力,减轻脑缺血造成的氧化应激损伤。更多还原

【Abstract】 Objective: To investigate the effects of folic acid (FA), vitamin B6 (VB6) and B12 (VB12) on plasma homocysteine (Hcy) and antioxidative activities in focal cerebral ischemia rats. Method: Rats were randomly divided into four groups including sham operation (Sham), middle cerebral artery occlusion model (MCAO), MCAO+FA and MCAO+FA +VB6+VB12(MCAO+CV). MCAO model was induced by operation. Plasma Hcy, serum and brain SOD and GSH-Px activities and MDA content in rats were measured before and 28 d after supplementation and 24 h after ischemia or only after ischemia. Results: Plasma Hcy in MCAO+FA and MCAO+CV group were significantly lower than those in Sham and MCAO groups after supplementation and ischemia, and the MCAO+CV group lower than MCAO+FA group. Serum and brain SOD and GSH-Px activities were significantly higher, and MDA contents lower in MCAO+FA and MCAO+CV groups than those in MCAO group. Conclusion: Supplementing FA, VB6 and VB12 can reduce plasma Hcy, improve antioxidative abilities and decrease the injury by oxidative stress following cerebral ischemia.更多还原